SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d6e0e3d095a6c76ab49bfe1e3ce69a6188f8554de52b35366005ba2837c12ba' 
  AND token = 'EljzrtWqgKHipChhLfJUfxGidWsqBIKGTNfLPY54B7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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