SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72d1e9f115a2a1a894b502fde2a75e70d04ea85e95c70f3b93aea766c34e6869' 
  AND token = '/JUZBls7j+r8fcq08dRPUAT7qjDGVJtJTFEZ/KSDBYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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