On the
TAP website it says:
We hereby inform all passengers that there is an additional mandatory documentation check on flights to and from Tel Aviv airport. This control procedure occurs before passing through security control and may have large queues. For this reason we recommend that you arrive at the airport at least 4 hours before the departure of your flight.
Note: boarding begins 45 minutes prior to the departure time.
So I guess boarding is 45 minutes before departure and not 90 minutes. Not sure why it has such an early time on the boarding pass.