SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '601ab5866b75213e683e105cb557f00bf8b64d98f6b14642f50c9b095c3cdf44' 
  AND token = 'zI6MI4baTLsMVr99WqhNI8YPJ7GUpPPszweWlN7KvXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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