SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50263d2d7a4dae574b61b01b14b2e3443f6076a35395e7549bbb8adf791485c4' 
  AND token = 'eoSNBGuZXdfrisoYnvUFk2iSq04Iq0BsJrjgVnVMQNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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