SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '633c991029b83d32756bc704e979a26e8efac6e254f96bd1fc0e49db436ba943' 
  AND token = 'B3nSyh9DRGoQhB/XRKrZXZRQq00FVD3T8qhPejxW6pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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