Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6223607e73b34207f9ff40eaed8c0353025bf3ff747d67c644d362feae8af1c' 
  AND token = 'B35f/NmlCl4sWMmvwfkTL1+YPWYS6hLBMvV/jj/yS6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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