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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3919abf0fb7895ea789d28d7fe3c65d139d0e24e71d3884eadb24862e47c7e31' 
  AND token = 'Yp6qBhENc3v4airqO14RwXReR0B6FSs7wWpoSiOAdTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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