Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfe5d5ff2d74a283f65766f1742e5862eef66dd895b76b39050a9f58142d5a12' 
  AND token = 'fp5LePuveTv0rfxutJlpfb8aFWmKxBz5HJH0AOLqcHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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