SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3487b8475d83aecf0ebf3705fda478c9a6f0636c23fc0a01866aac2e6b978c6b' 
  AND token = 'gVFNIjpDtFKF2F9N5Cb/7DdchwYGhuSZSFx+Ml1F3yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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