invoke cron with php

I cannot use wget, curl, or lynx to invoke cron because of a firewall that blocks the loopback (crontab on same server as apache). On Drupal 7 I could use this in my crontab:

$ /usr/bin/php /var/www/html/cron.php

But Drupal 8 does does not have this file and uses a long hash. How can I do it? Thanks!!

Drupal version: