SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c6dd9b11739b74f2c4def1b538f8485bdd56901a132af3cc63dca28418424d7' 
  AND token = 'vZw7t06ualUKIZcILWSTB/V8Xb+KDmCQEVT4vSejoGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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