SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6e2ba0bffd0cad29ac55b99a05f3b26f88d8d15f8d851f6f998946847fc450f' 
  AND token = '1+ZEv0j7d7CCLHhwQkKTMDwx8e94z22UA4Snmh7d3qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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