子域名自动重定向到https

I'm having HTTPS with my main domain ie https://example.com. And I want to use subdomain without HTTPS ie, http://hello.example.com but the problem is it automatically redirects to HTTPS. How do I avoid that?

This is my current .htaccess structure:

Options -MultiViews

RewriteEngine On

# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} ^example\.com [NC]
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301] 


# Handle Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]

# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

UPDATE
Alternatively, You can add this code : (I think It's better one)

RewriteCond %{HTTP_HOST} ^example\.com [NC]

Replace example with your domain name and Add this code after line 9

RewriteCond %{HTTP_HOST} !^([a-zA-Z0-9\-]+)\.example\.com

You can make this with a Middleware. For example:

namespace App\Http\Middleware;
use Closure;
class HttpsProtocol {
    public function handle($request, Closure $next)
    {
            if (!$request->secure() && env('APP_ENV') === 'prod' AND [your chek url without subdomain]) {
                return redirect()->secure($request->getRequestUri()); //with https
            }

            return $next($request); 
    }
}

Change [your chek url without subdomain]

And adding setting the rule at Kernel.php:

protected $middleware = [
    ...........

    // append HTTPS middleware 
    'App\Http\Middleware\HttpsProtocol'       

];