SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb0eacf9e66c22fdb6b2d480867382963b5591153942d335f7343e779a53a5c' 
  AND token = 'urQ2V4zX8ISmYPcJ7olEjlsAlsvRbsoGCzVEkvTfwM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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