SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f65e3d6058957820d3b9e4e2428aab6d17ea3ccc55c23f0a09e7dab607f9a0c' 
  AND token = 'MSzhVU/EEgvOW7Oh6vMPAwZ6KJ1zH048luPbUBiB6Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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