SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f7d334562ce4c1f11d891cbd76d01ca5ea97283b9b0cfaac529b78de7b0d233' 
  AND token = '/9N8PfYARevL88QH6IuN7Tz/DQRZJLICG3M+SPWleXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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