SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63b071bc068d324a0ffafb7097bbbceebaf560562c252c4f07d3c155c63e7a33' 
  AND token = 'FLhfUBkY16PnUqnx5VpX4S+7UG/X/Hl2Fjl1PSj+yuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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