SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82e59c010800237225924b6f25014bcfa20bcbd386a7c06a386cc2196a3e722b' 
  AND token = 'GnLql1GQpf9vUxNI7n4MrCXtSGmPhTBnc5JgK8Byze8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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