SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '753bc958c476651a409ad35e7812941f57688d43169ad1842d073990efc333c6' 
  AND token = 'FSmPDUZkCOjmd9H3/lAJa79nsh5/i5IqVLSXJxWP9Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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