SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b346bf285cee79904d4aff9f5ef1300af4e360ffeb1c2cf516e475871e25481a' 
  AND token = 'UXcI2ZUjwsA/03y63YulS9/+f8oKG8/Gzuzj90Flawk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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