Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e3bbe2af0c5e9502d17c3db211b9ce1aa2042819dbb7a6b0371a876a247d38f' 
  AND token = 'ydx4lykPd8/GFJu3PujWgX3RlhlTv9qVX9OqXwH0ey0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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