SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc8f2ea77983dd7f41892efea602f0cfd50c72929820989f2db1503b18128c29' 
  AND token = 'rwGBCwqIDwXqE3wjn/MbwKxggGn8TVw8/I24vCPWiLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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