SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5031249eefd069d88a9b50c381b6b35a2ef7c0487d5a726660e8fd03b59491f' 
  AND token = 'qfx8MSB6xdqqOLYsCZF8EVOrYJ6j4avBtr0ArWlGB0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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