SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da225365f188ccaed33852719fb11d173df868a89130f6db52b991c6b7240198' 
  AND token = 'ItoVoZrpT+vMZnbPQCuPpO0saTfXyizv/9VYZlcCu3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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