Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df684174f8247322b9285bf8bd130997f0340ca1363061516a698030368a0f89' 
  AND token = 'MXeXp0Tpk0UPagRA3v62471qV/u164bZXih3JqqncQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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