Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b24e3641dae5e13be68729424058e821bd91c0e261105d1ef814717a4429a5f9' 
  AND token = 'arjMc2mI5bjTzMrLxXcwU0ITkPKzMYzRijiKm6xePyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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