SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3044e5b49deba94c3389807622959fd15d6f9a6d241129ca77e4daf4776d01f6' 
  AND token = 'Q1CwjWdu85YVRQvifhCqFXs5nJlcpiN+7BMFSS1WSN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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