SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07c1cf33b11c437604bc1b013be7fe6f09dd897dfc56cde0d9752f185038ef27' 
  AND token = 'v7fFxpImyWw+tuIuvqRzsmYQr64sAN2CCXTU21ZuopM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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