When Flying to AMS you can have access to the lounge in terminal A. It is not the AF Patio but another small lounge. At this time of the day it is baiscally a self service lounge. You need to ask at check in the code to enter it. You can have coffee, some kind of WIFI, drinks etc.
walk 20 meters to your left after security
The lounge is called "Salon des Vignerons"

enjoy