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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40b44ba2a0be4d8bedc709e6d8fb9eca0adb6f9fdda3a75b1ed5838e273c35f7' 
  AND token = 'UDtO3FsBHPq2P8g+TN6vej/MU+NloOlGN4re5zCHdIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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