SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8828aeb262f28da8254a42814e3a3217d83335c1cd04d66a5e0b6ddbb9b665b' 
  AND token = '/2C7UnWxXfQWjfotS+Rxg+aHsnMFj3ww/aqPVOfvcos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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