SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fec1a9921d0c0fc6fc8d7207d23f795450df17639263ef884c23adb105bfff7' 
  AND token = 'k6RPUMGVBScfibR1xxnDgjnhkeF+BHn1aUCe5ZJAKWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}