SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6854e271f361c184e1b055ea3d923dd7a3149f8950dfb3a827cb0869800a4453' 
  AND token = '+06y0aoCWsGZsB16HaT5FpZmBBY6GzASXc/prxLhBRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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