SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7a1630aba9e0ab6c4b3cf7c3de8a2699a9675dddf32afbf2473f9f1a51c2882' 
  AND token = 'YAqEhuqzw5AiutJgiNWf+hUX4jHKwniFDwwgkHJSyFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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