No, you cannot.
Try port forwarding the management port of the AP via the public IP on the router.
http://wiki.mikrotik.com/wiki/Manual:IP ... rt_mapping
Alternatively (better solution) set up a VPN server on the router and connect to it, you can then reach devices behind the router in a secure manner.
Specific answers require specific questions. When in doubt, post the output of "/ip address print detail", "/ip route print detail", "/interface print detail", "/ip firewall export", and an accurate network diagram.