SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '512ca5f30fc605030001d708f7a74a87f725ff3f062237d97d3d345ae510b7bf' 
  AND token = 'xmVYhhEiKnhLD8T+PNXTWRTCiJFjVkoKDja4s6HDHQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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