SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef695d31d550e04c03d3371eb5140f3c7fc3afc99dbbe9e86274a4c78734d776' 
  AND token = 'DVbGDBTKcwzZgkNoxswf9VB/qowkSQqx/V2qwd1PZS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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