SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32bfef6d8202584cae09baff0fca2542554009846f0e26881c796fed8f21aede' 
  AND token = 'JyY1Gume5OwCuGeGbjuDfNgI3h/sW3U6/qFAEo+YrV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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