SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ececd106de20654d19b492284c9d0ff6b9096e0b4418479bef2aa95d22517482' 
  AND token = 'BxxmXBtk/bYEP2Ve5YjOCZg8Px8V+9UQWJwhfdaQXKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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