SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7658f5f1396238439f07a6c8209c1ee8a55e8fbeb17f553b94b40360aa279a74' 
  AND token = '4kVPOJJnIcWOarsCDZamjBuKuFfzfNLlK8cnY8EhMdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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