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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0d795d9a5e02b60ff66f67d789ba082cd6051c08652e47b3c29cc30fc408058' 
  AND token = 'nhydilnDnGmbDCbpepthZlMIOGvJwyI4NeppBMVkOAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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