[Appointments+] SEO friendly URL

We are trying to create a SEO friendly URL for the 2 services which we have created with appointment+. What we want is to have the URL:
masked as:

The same would be for ?app_service_id=2&app_provider_id=1 which would be masked as /konsultacia-30-min/

In the .htaccess file we have placed the following line which does not seem to work:
RewriteRule ^services/products/appointment/konsultacia-60-min/$ /services/products/appointment/?app_service_id=1&app_provider_id=1 [L]
Any ideas if that is the correct way which we should mask the URL?