This is the adopted answer, thanks to @anubhava:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^(www\.)?example\.com [NC]
RewriteCond %{HTTP_HOST} !subdomain.example.com [NC]
RewriteRule ^(.*)$ http://subdomain.example.com/$1 [R=301,L,QSA]
</IfModule>
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