SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff642fd52fb65ca12397649d48eb7b03c0e94e2b4153361d7447d6939658f8c8' 
  AND token = 'inDhhfinq0PkXuKlDCFX6+37Cly7Grc0V/dv7e+5KZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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