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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4d59bef132515b96f62043fc39bc49a85272e1135c18538c079e209634d7e0c' 
  AND token = '3bamR1bLy1QD6ncxvO2bhwEgCXT5+tUCYiKy0qzM6iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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