Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dccfcb8e19329283b197ad24c9cffa88e89152789a2c656149e9d7077e436ea' 
  AND token = '6vk4ixWEMnXokXRM8lZGsWL5UtI/g2e569btzL+0XiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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