SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb88f948bdef13d091d7c08d6976457882f1518b465bb72947ea929fb3cf1658' 
  AND token = 'fFrKKBg4TnvY2GhQ4wnl2SufBupiMb9Qynk6B6Ehs2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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