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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99174ec426a9ca950d3c0c924b8b63fada6260fdc045d03363f8aba57009cc06' 
  AND token = 'eTN8YtVWbUc12YaY8YjukdlAIv0uKQnIM4umW3BvERk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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