SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16d678d36c950a990a4c327716ceb70369619cde81568897f4539802cd6a7061' 
  AND token = 'z5ZkdKVTxs6Fi1F9uhcBVKPBOns0iKZ/jwp7Q++qzJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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