Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcee7454aa64632d7ca483c65dc4adddfc3a1d660ce0bfb9f45e72a1c3b2ba48' 
  AND token = 'b/7EFp8SP3lnnjzs/0zpermcityw/qdOPnymsNHuag0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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