Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a948bb15e1c4f73a41a78ea9597a19d79e0d88d8fb8f8845593b2d142b04c891' 
  AND token = '/FTviaPTYRsrf4dNtKE7shcIzeM+iUOxvQMFHO3LJtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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