SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8226603218ff62bd8da6047441667f5ec346a753f3d40b19dc766c932785a9d3' 
  AND token = 'Z5INbaHyBzT+rmYavQp4ITFqYcuX1FzQkmJ3MWWUvx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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