Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5197c5a0e42d284e78065ab69b8223f6ee14f9a9e16b580e4eec560487ab2f1e' 
  AND token = 'Mkvnh286X1095vcJlipVbSo6usCKutJsVPkEn/jjFGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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