Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb3ccba8fb7691f735b84b8992b56be2bebc1239388fa21d8861736a56852da5' 
  AND token = 'ONz1NP6UtoFGIi2CUtV563q8wm4txfvYbe/vTbhxSxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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