SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb2ea3d728b9e2d8c726e3fb09199ac5d7321c2da1f98f254ce0b58224c6a07f' 
  AND token = 'XPKK1i9f/wQg5T4B9B9JZWd80qxKH16KdjuoxPnMlMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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