SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bdb772a24a0c259bbed6cdc48d36fc48d38579a250047565a825c060a5c9ea7' 
  AND token = 'oVpF/vKIafwkXPwDjDTGDq9jDSKQ2z7sfAUFBJexCuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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