SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99c8ced3cbcdb64787ea62fa1ae550417ca96b3a22095a2d42f7307da40b1026' 
  AND token = 'OOCYjZfCXqme5FTX8xRC4Ol0kqYGAFayLnCz/GvJ2JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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