SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f69a40f7dad07b571808c04e34b0900d93b34c80e24ff1a5a4a91f096d754587' 
  AND token = 'hz8SSt9MBDY8KlMn7vwkJGkluV64fuq/Jh+hlyJtOV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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