SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79796af3561abe96b2305d59719f1b70f6f4d9c033dd2d7a8017e40fb7a9f866' 
  AND token = '2Kzpum+2bcpLCBwo8ZMJNHlFGu7QANmTbmDMX0WelTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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