You can try this to exclude that single directory/url:
https://stackoverflow.com/questions/...ages-in-apache
Code:
RewriteEngine On
RewriteCond %{HTTPS} =off
RewriteCond %{REQUEST_URI} !^\/page1\/
RewriteCond %{REQUEST_URI} !^\/page2\/
RewriteRule (.*) https://%{HTTP_HOST}/$1 [L,R=301]
RewriteCond %{HTTPS} =on
RewriteCond %{REQUEST_URI} \/page1\/ [OR]
RewriteCond %{REQUEST_URI} \/page2\/
RewriteRule (.*) http://%{HTTP_HOST}/$1 [L,R=301]