Shuttles and trams work for me ... two adults, no baggage, in and out (after a few hours, I'll assume) and back home the same day.
What do you need to do at the consulate?
And where are you flying from?
LGA has express busses and shuttles that go right from the airport to Grand Central Station- very easy and i’ve taken them before...you can get the info right on the LGA site...if departure/arrival delays are not a concern definitely go with LGA- and i’ve flown from both a zillion times..
JFK is best for direct, long distance flights...