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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73996bc5265256b139803b243cc287b20877c6d2a20c7f19cd7995f7169e5609' 
  AND token = 'hkENgySMgb4jhV9ro3r8wWvPkAd7uKpr1yrf6lk0MfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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