SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10b86dbe66f7cdb956ffe4a3be1e5a186b8ef42026801a5d1501a1895016b439' 
  AND token = 'wQ4TZgbCMWHQJezfOvLIdqpm3Zwl/nOZV1u4RZzLpLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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