SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3fdbae5999342dbb81d71ecd66292d37f1ec69c5b1f4537f68841469dcccf2b' 
  AND token = 'qhEGgQP4CSRtHGBcFwbVSpQY3zO+zgREuhh+GNUtm9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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