SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19c4f7965d457bc71ed34805fb77bc293465c55f6a5fe1f26911cfd4ceb41d8a' 
  AND token = '0vwEx5pxu3ioz/rKPnGqGMZPntz0ycEOLDs8KJsshsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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