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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee218f433fce7632eafbb08ccf38792bd06012f9d9b035a7e6997b62bf976fb8' 
  AND token = 'Sr0KfSuiQadxTirXQyDv5+6+rDgKaynQ0HxGYKhWOiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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