Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '639aa5a8a600db8e5e7babf98cc0ae131c892b5b4b6be439356ad4a16697b6d1' 
  AND token = '2y39paTeblPZHzEdDBbv+NKMKfRyofCTpq35kDTGz8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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