SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ca463b975d9eff3435562f72d7205e6a82275d2e0bfd63e02f50308fd12fc5b' 
  AND token = 'PdowjrYMSvRX+fV+Fs+Go6POSdwG7f19JXUsHzAKU5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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