SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33d1c30a41b4277bbb62652745983047c586eb1e6d23c8a3c8848c4a00f99487' 
  AND token = '+pFWUt0Z93MVkMwMJZ7U14YHcb4cGD/+/dhqwWgugII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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