Cab ride to most northern Kentucky restaurants is within 15 minutes or so.
CVG airport is in Kentucky.
Great Chinese and drinks sitting at the bar at Oriental Wok, buttermilk road location.
Turfway road in Florence has multiple spots that could be of interest, most of those are predictable menus and atmosphere.
DeFelice in covington is a fun spot, good food and live jazz. Covington could be iffy with your 3 hour time frame. All would depend on time of day and traffic. No traffic drive time to Covington from the airport is 20-25 minutes.
Take a look at google maps and follow interstate 275 to interstate 75 south will get you to buttermilk, going north on 75 will get you to the turfway road locations.
Barleycorns on Dixie hwy is also within 15-20 minute drive, very casual laid back atmosphere.
Nice beer selections and lots of televisions. Local hang out with great chicken wings.
Crestview hills town center directly off of 275 has numerous restaurant options from soup and sandwich to sushi, burgers, Italian, burritos. Our favorite there is The Pub, irish decor with many beer taps and nice selection of whiskey. Live music some evenings.
Nice shopping to kill a few minutes. I'm sure the town center has a website.