SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b616fd27440d5078411e9e178a08e215a30e43112ab2fb7bd1df17938b8a4671' 
  AND token = 'j9ffSPvE+IXgxcVFrTIxX6sgUY9sRq5uABVwkUPSd+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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