SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '933feb00bce8e0593a372a4975da2d122fc483c04abad9f34983d3863decc69d' 
  AND token = 'KeVBCdJEwZNowZwH0w15I93QIqZ7HlTSRqTXG7FY+Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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