Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e82cf7fc45e30c4fbd5cde73b8c9b401a510839617e93543cf7a1d247befa7a7' 
  AND token = 'DL7PM2N+ucP6Rbd4WLz+wbLwc7tJWm9Nhaz5QVd+Bdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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