SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4753c176df29f7bfb2e935ccf5118296b72596f766b6b01d68446b7028e7383b' 
  AND token = 'yBLkBpWZ0GzXJv0YyvIOrfn3ysWA8eaQkzcrdKPyl+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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